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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9530e2cfb39df13932c589fdca59d8a427d75944c9e4e51afea04d0ece25bb2' 
  AND token = 'o4EGrol7DXZB5f5MaH+FDhlZmK8uy4bJpacPm3gTUi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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