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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a97935c380ee5614839bb37e16c1211376e91b438d917506039aa90a7dbb063' 
  AND token = 'P7S/CuL7CQGqNz5Cr/dmRff3k+cCsPj1Xn1Z19K+flg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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