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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13454e3f5de853936c125a5785d00aec7ec9f1b71dea175cf734805829cf6133' 
  AND token = '6npLGbDjQDtgXJESeNo9T56Ieonvy7GOYn20unpdwR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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