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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fee4d2418ac9c43edff3d510c7c80da9b2a7ebfe06ae215eee9c99c6c2f53e4' 
  AND token = '990KmV3MIs7IfEKV/sWM2fchL4QHgRqRB53KIjri2ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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