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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957a7f0450ebb354c0b264dadd42b389c26260dbcd1d7bc633b1a9168dd3c93f' 
  AND token = 'EwwQxfblOgJ7BQP77gwo7d639yYoXM9E1UgZbPFHEdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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