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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4a69fd8ab7dd570e2caddb3fcf64f9d769f7ca74659e7d64725baf568921d1' 
  AND token = '+Hak52G86uzeVU2TKl4gZ8Nq4B2DT5txkz+rR2s5i4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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