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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3facb93b5d76a138d465954c024b7df90492bc58b69b3401f1c44a310f81a0f3' 
  AND token = 'g+Qg7c0xHdyJPaHyDYqMt2vH0O9gY8hQ4IwCyxn7wJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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