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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9920db9ac2905c05b43f3c9b8a053ae3fddfa225a98b6e9964c1641b8cc30865' 
  AND token = 'EABlsydlAGNStK3fbGZbC18yWQgkDoDHlTnLBDCdx7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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