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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d5893932a2a1021aefa95b953f2b7811755e24e65b9824cb55aa1b091d0262' 
  AND token = '91Gz7bnx4QC3pFh8N6CnyuI2MwlxebLGrV75SEqt960=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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