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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd165e6e685e9ec34e985345de30a95da27c7c220ca9bafcf52bab0bbe8873e57' 
  AND token = 'Ahe1AISeJ5GfPUJZLwUPvhMTCSIr1a6/uNMu29mbnQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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