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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '220b2dc01f7cf20b8a0b800a87e4fc62d734de43940255118a95c30f0ff46036' 
  AND token = 'duee7Fm2Dquur+nB1t6/Selb9ZDhdZsT3l10qNjzgXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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