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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7f1fe703a0b8792c2e56b5e55d38e4561cd6e9550f30626dc4446aa087d6bf' 
  AND token = '/yaJxA0SzveTM6HPMTRNsrdPt7lgw7QJWczDR8y8Tuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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