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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8262fef82045bc1da4307f0e0ec05376db7a82e5233cb371aba5a54f7a1fa3eb' 
  AND token = 'Bd4CoYOhBSUw/F+GzBm6oV4CKynGOSdAFi2Z4C+cbeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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