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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36d95f9c2da480754442c636c0807e612ed938d46d697852b18dccc751ed061' 
  AND token = 'B7e5uUend1LKT43IQwRZW/KBdWGK+aga0iz9ssNjVGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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