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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '527bf00ce816f42c78d5548d474fc3d38a1b90e4d60189a1700c3fc1aaebcb8a' 
  AND token = 'ct3voXS3qI0sq397bKmLwQ2jVpulNDE/KwX60ochOeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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