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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fadc89df2fa02886925e847be37411c983c8dabf3bef00e7d9143ab004013b3' 
  AND token = 'DgUWrKshbQwxdk+P47IQNxro0EJl4fyX3VCARSExpAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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