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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac18f9ec91150c9bead4a72fa8e34d79ee8ad2e6781c2b4dd9bab5d8a1683c16' 
  AND token = 'lqlnfrQOuEYkl8HslV3RhNCY83o6LB+vGDTSPdpczqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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