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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90794aec03bcbe4720cba4ac8a2c2ebdeb9f4fe5da6af571fb6564f88b0f4bd4' 
  AND token = 'q1RcAk5HWAhyBAbV4LdsK9CVZkiT/MFRR3NiW4k2DOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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