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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b344ab999e745c87fef1ec3971132166e9dd5a24ce7b8fb006eb85cc78cd6ddc' 
  AND token = 'i2x/bseIOp1vT8n+1UVPSdFNtBB8KCcuXBB9izNM8WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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