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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31c11a818c1b7cec7f4f5b320fd70e381d1c3f2e992cbefc5f21b141beb228e' 
  AND token = 'c1NPrlt+hAUfmNJIDQokSU50A1islvL7n00BnW8Qn0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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