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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209b7ea870ba166e7652896721bc4f19699413ffb608bbff94fe296c8eaf0488' 
  AND token = 'uqTn1MkPWizsU9r+TqlsuX7nqNwk0UGjK114LdkUyUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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