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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e35058cb2eb24344c8d67c5035225fea654b59d6fa49c25d7d9042bf8809ddb' 
  AND token = 'ovJFQ8sMX409zR/CA+uVSF3trcMzozHMVBUqqIMFFWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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