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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8674f58b10e77f73efd3e9eccfc038947c2876eec28cac2ae56c1bb1588257' 
  AND token = 'oSP4Ff/idSZ8203PlaZBGdgte4h2hW5P1hhca8/n3NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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