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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34bddcc5dda2711aa2140514a9b2de2b3bc6149dad8f5d68f5213ebaa1b830b' 
  AND token = 'ZssYx2L0buxiKNLsqlvku5ADWSkNMIu98/vRMZ6Iw2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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