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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057fe1ebccc320e8c6d695dcb01e7209ad821b9438760f99acd8968824745435' 
  AND token = 'JxD/p0xk/D85oW4adwAazKzrdn0MUT5dxEKA76OV4d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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