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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf73287995aa2786403f2d8daf4b2d16f623728d8c30c32471211bde33db19e5' 
  AND token = 'ljGu75ApBjqXaNj29XR6lufPgQTp+sExclJzWy007MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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