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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9b95b43864cf1f1a5de7d27b12feefdcaef74c90bd5f08463663b2cfbdb241' 
  AND token = '9p0mzEZh8gbhAdx18Wmwk1hJo/Iha/sMC3pm/d5mHyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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