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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27981281739be29b20189d099f5ea38ff96ad4fb4cdaefb95e0c5110a7976fbe' 
  AND token = 'AEwzSVvJBoBh1asXw8XC0o6lIx+q3DmqnIneDAzFhsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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