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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ea31261c24994dd8a5d950eb0c4e25ad36c2892a84d896390c6fa1b0be4464' 
  AND token = 'XRrB5Cyy+iqUd29I0/AIZOB6MOvuInFxPzBawteg4V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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