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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2162730f000662de2c5ad549033502550a5fb169413ff2bd710069632332cd' 
  AND token = 'ooqGgRx5ny3P56a5xKSX/5lEVYvCFQqmvmSx8f6GtpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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