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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20882866ca3f73daa0a549e51e565fe569a579f0c72e469a8cfd79b427c331b3' 
  AND token = 'DcYP4Lz73sP9ZVQuxNoXf/H97dRIxDoKbYX251ih3kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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