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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e45b5e013329fc25db8d907e23234c5d66c58a943663938b024ca85a35a98c4' 
  AND token = 'a1cCe+/KabBLGgNvQ1Edn+HX2M1DcpzCwYlWcfqkpm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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