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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ebeec8a90ea3c4082efb8f47f928babcabbb665bf7195a97b7007558b2de5f' 
  AND token = 'CXnfXsOSBBwME78ycYxGae+HsJ2aHoU4z4snp2No5qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}