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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a327650fc9030c3cd30b2ea86c0ae841f592d6c30f2973d174a3384ff050edf' 
  AND token = 'KBOApg6DnGJI1UsLn+Ff2qUKY438r5io9BZEi62nDsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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