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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285a82b4bba9749191cfd889eeec4c3db59dedcee898ddbc727a89935fbf5627' 
  AND token = 'xRH1Xc76KgicTS5W105xC/MrH/TJbG684up6A9z3f4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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