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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1791d1119aa3f71cfc916814d3a0f4665834317c13412468e35e7301f274c5a' 
  AND token = '01ArKYkuHppkzT1o1CzmdvT4NTmsAcM639IpE40M0u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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