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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b185a8697bab6e402525310ea6a1b0f311c49b0f735d5cdd7233993c1293232' 
  AND token = 'LEgPEqNi5AJxmYG9OElYhXT40X5ni+cDzDtkcFnnMYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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