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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4b15510e2f171da670fab601eb6cb251cb244a348804affe000063add571ae' 
  AND token = 'ugkx4tt+okAoq1TrB4gduajA60OcYxpNVjgHkJUYExE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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