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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bb19a02095a145317b82132448080478af7678ea3ea0321da7d0ad9698039b' 
  AND token = 'Qn9i64zPv5Dmn6CZqW7IZ3/zaVFpRTS2kF+J+nRU35c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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