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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8c21d8f3c6f15463687ccc1c22b7d4c5c552e6349bab7270764d1e58242eb5' 
  AND token = 'RMr5yC1aEeRpV+MMVWBJH3i2Rx1SzYQ0wu+JmW1x+Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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