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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49367ddbc1c0715c7679c0ffcdb4c1ef77268f5a8759766f8cfa2fb2084a3e8a' 
  AND token = '7HX7fid0E8G3mYGKQRDmbrbWC6OryQcg0AEWwway1mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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