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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918c9844cde07000670b4413c7ca7db4e0102ce1873ca2f9fc1262919f9bede9' 
  AND token = 'GCknTg/0xQk6lYitJkyYwV/SgWAezVJZfyVtsTBGXyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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