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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f362bd9fe0575f9e5be7fb161f225d2697e037f478cd396a1a20e4310b605d6' 
  AND token = 'g8U5vnS7+Su2NnXC8FBoRTlYbHR1g0vwH0x2l3tn2sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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