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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e908cada6ffcfbb92838acfb140fe00d40f7cf4d493e38074153c1a6adc599' 
  AND token = 'y6uwidV3CpIc5t2UEzBfpptoNeHAbs9kDnR0bSc+QoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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