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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877e14529a058f72a8461bd5da80ee6d137fa18c380072589ec17a4921f538e7' 
  AND token = '74PGX1AKAaKb1+db3XP0YoCGoh7cVFdjC5vP2G9iSRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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