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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66782f312481b0062b2ac05c6269c556986581ef101e95e54b78c96ca81d1f77' 
  AND token = '98mzE02C7JOKR14zgZVHjTcNOjLnKSB/V+1Ce7IHJZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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