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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c9c25ed8e4b82d71c3c1aa52c27071297a3fd5e6a1be2a2cbb1a6aa66c5773' 
  AND token = 'GcY74xuLaEIai8bkYDml60Q1A856RklMKQcGM3qInJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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