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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367ff6819e553f4fd20c528e0819dca08331e43ebed8be84f16ffb679f564edf' 
  AND token = '2TmG0ub5jtRuFOpj465ICu/rfjsvjHgi6N9PEny/3H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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