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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cc4719be7f653a7010e0fadefe8bbb452bfb5bd1ce502c58169ea5fb093da5' 
  AND token = 'h77kg1p0mET1bruU3ht+0RTjQAedzt0zP9TRY9oJbBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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