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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc3eb46ec4a883d1a9ab968a920c30f0bb13203139cce196b9567a779a98526' 
  AND token = 'yM4GjDkOS+BvdWOr4EWLetpCOi8WHKBvTF8j2P4B6vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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