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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685a4e227df70cd5b299d425235b77ad433579f40fbeba02c70ad469acdcd24b' 
  AND token = '7EWtyXSXrvab09xX4Msl5T1Vg1aNYUmehFDA0tbAsTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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