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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e109d9250adbc996b612c05ce803258abf480332f077e595ae665382264162' 
  AND token = 'cgtm079ZA0wCLde4o5G7zteEpRRyiFEvzTiukMm7J+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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