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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0868c5281f39a2abc084ed2eabcd045e25ad1eb6bbda2987e425b69c97b559e' 
  AND token = 'Ms1KPWZTH3bTAZJetSdluZGh4Q5KckNEHqjE5ks6Pn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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