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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76465e6efff4aae90be9ee352c3baf38f8146a4e79f9e4b9997aee65c0b536cb' 
  AND token = 'GnHyuZi4MZTflCKxkdcno4n2Ex41jwaJLvzKYaEkaHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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