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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc8f26d13c6d5d1c7038cf128e0a5b5650c3e45c4961b6037b9ba7075f3a427' 
  AND token = 'pNto6DJ9SO7msfAMWNgId2w9FgHR/Q83iidWjtq8RfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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