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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d47f287f0526b797a9449fe3ca7eae620551b06fb69590aad3ac064d19e04a' 
  AND token = 'Np2qik8JDHDOiAMYY/Ovg7gl/U2UZpsozOESbykmksM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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