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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b4133c8d1d8734a09e526776d1354247471f5c667aec7a65b569dcd3267d7e' 
  AND token = 'm2Mm3wyEjwlGNY6i9bzca3haW7Z/zNdtBoaurUBiKNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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