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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b0527d41f19f3211d3aae8530c378769418598d5ad9144aae9550e4f80e5dd' 
  AND token = '4OR1Fr2HzrUx8f6CbyyeU+Cx9kmbaZ9c2mHca/fTrY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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